judy garber is with boston's dana-farber cancer institute. >> i think this will have an effect on practice, and particularly for my young patients at high risk of recurrence i think longer tamoxifen now will feel much safer for all of us. >> reporter: but there are significant side effects. most women on the drug immediately have symptoms of menopause, including hot flashes and night sweats. still, carrie capossela says if her doctor recommends it, she will take tamoxifen again. >> recurrence is something you live with for your entire life. all of a sudden you start hearing all these stories about women whose cancers are coming back after eight, nine, ten years and you become obsessed with it again. so it doesn't go away, no. >> pelley: tamoxifen has other rare but serious side effects, including a risk of uterine cancer, strokes, and blood clots. but, scott, researchers say for younger breast cancer survivors those risks are outweighed by the drug's benefits. >> pelley: elaine, thank you. we're learning more today about the man charged with the colorado theater massacre. the university of